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Expresso takes a simple musical expression (literally "X") and mutates it.
In each generation, transformations are applied to
components of the expression. This is a fractal technique known as an
L-system.
The more generations there are, the larger and
more complex the expression gets (and the longer it can take
to compute).
The output varies wildly, from boring to fascinating.
Press "Mutate" a few times
till you get something that looks interesting, then click
on the image to play it. See Composer's Quarry for examples of output.
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After 19 generations the expression "X" became this: | (transpose((shuffle((step(shuffle(transpose(((transpose(shuffle(transpose((X+arpeggio(X) ) ,4) ) ,4) +transpose(((arpeggio(((arpeggio((X|X) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ) +transpose(step(echo((((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ,12) ,7) ) |arpeggio((transpose(echo(X,4,6) ,4) +transpose(transpose(X,-7) ,7) ) ) ) ,12) ) +transpose(transpose((transpose(X,-5) +transpose(((shuffle(X) |X) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) ,4) ) ,4) ,12) ) ,4) ) ,12) +transpose(transpose(arpeggio(step(((X+X) +transpose((transpose(transpose(X,-7) ,4) |step(arpeggio(X) ,12) ) ,12) ) ,12) ) ,-5) ,7) ) ) |(transpose((arpeggio((((transpose(shuffle(shuffle(shuffle(((X+transpose(arpeggio(arpeggio(X) ) ,4) ) +transpose(step(transpose(transpose(X,-5) ,4) ,12) ,7) ) ) ) ) ,-5) |(transpose((step(((X+transpose(X,12) ) |transpose(X,-5) ) ,12) |arpeggio((step(shuffle(X) ,12) |X) ) ) ,-5) |((((arpeggio(X) +transpose(step(X,12) ,12) ) +transpose(transpose(echo(transpose((X|X) ,-5) ,4,6) ,4) ,4) ) +transpose(((arpeggio(X) |X) +transpose((X+X) ,12) ) ,7) ) +transpose(arpeggio(transpose((step(X,12) +X) ,-7) ) ,12) ) ) ) +transpose(step(transpose(((transpose(arpeggio(step(X,12) ) ,-7) +transpose((step(((arpeggio(X) +transpose(transpose(X,4) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) |transpose(step(transpose((X+transpose(X,12) ) ,4) ,12) ,-5) ) ,4) ) +transpose((transpose(shuffle(arpeggio(X) ) ,4) +transpose(step(transpose(X,4) ,12) ,7) ) ,7) ) ,4) ,12) ,4) ) +transpose((shuffle(transpose((((X+transpose(X,12) ) +transpose(X,7) ) |(X|transpose(X,4) ) ) ,-7) ) +transpose((shuffle(step((step((X|X) ,12) |shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ) +transpose(((shuffle(arpeggio(echo(X,4,6) ) ) +transpose(shuffle(step(X,12) ) ,7) ) +transpose(transpose(((X|X) +transpose(((X+transpose(X,12) ) +(X+X) ) ,12) ) ,-7) ,12) ) ,7) ) ,12) ) ,7) ) ) +transpose(step(step(step(transpose(transpose(arpeggio(X) ,-5) ,4) ,12) ,12) ,12) ,12) ) ,4) +transpose((shuffle(((echo(transpose(shuffle(transpose(transpose(X,-5) ,-7) ) ,-5) ,4,6) |((((step(arpeggio(shuffle(X) ) ,12) +transpose((transpose(arpeggio(X) ,-5) |X) ,4) ) +transpose(step(shuffle(X) ,12) ,7) ) +shuffle(arpeggio(arpeggio((X+X) ) ) ) ) |(arpeggio(step(X,12) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|(X+X) ) ,12) ) ) ) ) +transpose(step(step(step(echo(transpose(step(X,12) ,-7) ,4,6) ,12) ,12) ,12) ,-5) ) ) +transpose(transpose(arpeggio(((shuffle(((transpose(transpose(transpose(X,4) ,-5) ,4) +transpose(((transpose(step(X,12) ,-7) +transpose(echo(shuffle(transpose(X,-7) ) ,4,6) ,12) ) +arpeggio(transpose(X,4) ) ) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ) +transpose(transpose(((shuffle(X) +transpose(echo((X+X) ,4,6) ,12) ) +transpose(shuffle(X) ,4) ) ,-5) ,4) ) +transpose((arpeggio(shuffle(X) ) +transpose((shuffle((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) |(X+(X+transpose(X,12) ) ) ) +transpose(transpose(X,-7) ,4) ) +transpose(step((step(X,12) +transpose(echo(X,4,6) ,12) ) ,12) ,7) ) ) +arpeggio((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(shuffle(X) ,7) ) ) ) ,12) ) ,7) ) ) ,4) ,12) ) ,12) ) ) ,-7) +transpose(transpose(arpeggio((arpeggio((((arpeggio((step((X+X) ,12) |arpeggio(echo(transpose(transpose(echo(X,4,6) ,-5) ,-7) ,4,6) ) ) ) +transpose(transpose((arpeggio(echo(transpose(((shuffle((X+transpose(X,7) ) ) |step(X,12) ) +transpose(X,7) ) ,4) ,4,6) ) +transpose(step(transpose(transpose(X,-5) ,4) ,12) ,7) ) ,4) ,4) ) +transpose(((shuffle(step(X,12) ) +transpose((transpose((arpeggio(X) +(X+transpose(X,7) ) ) ,4) +transpose(echo(arpeggio((X|X) ) ,4,6) ,7) ) ,4) ) +transpose(((X+transpose(X,12) ) +X) ,7) ) ,7) ) +transpose((echo((step(echo(shuffle(transpose(transpose(transpose(X,4) ,-5) ,-7) ) ,4,6) ,12) +transpose(transpose((X+(X|X) ) ,4) ,-5) ) ,4,6) +transpose(step(step(step(shuffle((transpose(((X+transpose(X,7) ) +transpose(X,-5) ) ,4) +transpose(arpeggio((X|X) ) ,12) ) ) ,12) ,12) ,12) ,-5) ) ,7) ) ) +transpose(transpose((((echo((((shuffle(step(X,12) ) +transpose((shuffle(shuffle((X+transpose(X,7) ) ) ) +transpose((X+X) ,7) ) ,4) ) +transpose(((((X|X) +transpose(transpose(X,-7) ,4) ) +transpose((arpeggio(X) |(X+transpose(X,12) ) ) ,7) ) +transpose(transpose((X|X) ,-5) ,7) ) ,7) ) +(X+arpeggio(step(X,12) ) ) ) ,4,6) +transpose(arpeggio((((transpose(transpose(((arpeggio(X) +transpose(X,4) ) +transpose(X,7) ) ,-5) ,-7) +transpose(((X|X) +transpose(((transpose(X,-5) +transpose(step(step(X,12) ,12) ,4) ) +transpose((X|transpose(X,-5) ) ,7) ) ,12) ) ,4) ) +transpose((step(X,12) |shuffle(X) ) ,7) ) +((transpose(arpeggio(X) ,-5) |step(transpose(X,-7) ,12) ) +transpose((transpose((X|(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,7) ) ) ,-5) +transpose(X,4) ) ,12) ) ) ) ,12) ) +transpose(((transpose(shuffle(arpeggio(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) +transpose((transpose(X,-5) +shuffle(X) ) ,-5) ) ) ) ,-7) |transpose(arpeggio(transpose(step((transpose(X,4) +transpose(X,7) ) ,12) ,4) ) ,-7) ) |((transpose(transpose(transpose(shuffle((X+transpose(X,12) ) ) ,4) ,-5) ,-5) +transpose(transpose((transpose(echo(X,4,6) ,4) +(transpose(arpeggio(X) ,4) +shuffle(X) ) ) ,4) ,4) ) +transpose(((((((step((arpeggio(X) +transpose(X,7) ) ,12) +transpose(((X+X) +transpose((step(X,12) +(X+X) ) ,12) ) ,4) ) +transpose(step((X+X) ,12) ,7) ) +transpose(transpose((X|X) ,-5) ,7) ) +transpose(step(echo(arpeggio(shuffle(X) ) ,4,6) ,12) ,4) ) +transpose((shuffle((arpeggio(X) +echo(X,4,6) ) ) +step((shuffle((transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) |(transpose(X,-5) |transpose(X,-5) ) ) ,12) ) ,7) ) +transpose((((arpeggio(X) +transpose((X+X) ,4) ) +transpose(arpeggio(X) ,7) ) +step((((((X+transpose(X,4) ) +transpose(X,7) ) +echo(X,4,6) ) +transpose(X,4) ) +transpose(((X+X) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,12) ) ,7) ) ,7) ) ) ,12) ) +transpose((shuffle(arpeggio((step(step(X,12) ,12) +transpose((((echo(X,4,6) +transpose(step(echo(X,4,6) ,12) ,4) ) +transpose((shuffle(X) |(step(X,12) +transpose(arpeggio(X) ,12) ) ) ,7) ) +transpose((transpose(transpose(X,-5) ,-7) |transpose((X+transpose(X,7) ) ,-5) ) ,12) ) ,7) ) ) ) +transpose(transpose(step(transpose((((X|X) +transpose((X|shuffle(X) ) ,4) ) +transpose((step(transpose(arpeggio(X) ,4) ,12) +transpose(arpeggio((X+transpose(X,7) ) ) ,-5) ) ,7) ) ,-5) ,12) ,4) ,12) ) ,7) ) ,-7) ,-5) ) ) ,4) ,7) ) random seed used was 164732213
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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